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The AMPM paper (https://www.jilp.org/vol13/v13paper3.pdf) defines the bandwidth-delay calculation as : Mbandwidth= (Nrequests/Tepoch)×Tlatency In the code, Tepoch and Tlatency are in ticks (which is okay), but Tepoch is converted from Cycles (256K) to Ticks using the clockEdge(Cycle c) function, which is incorrect as it yields currentTick + c * clockPeriod() instead of just c * clockPeriod(). In other words, the divider keeps increasing as time advances. This patch substitutes clockEdge() with cyclesToTicks() to keep the epoch length (Tepoch) constant throughout simulation. Change-Id: I69dee29892fa4b9eb8de8715fd72a535e122687f Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/46479 Reviewed-by: Nathanael Premillieu <nathanael.premillieu@huawei.com> Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br> Maintainer: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>
This is the gem5 simulator. The main website can be found at http://www.gem5.org A good starting point is http://www.gem5.org/about, and for more information about building the simulator and getting started please see http://www.gem5.org/documentation and http://www.gem5.org/documentation/learning_gem5/introduction. To build gem5, you will need the following software: g++ or clang, Python (gem5 links in the Python interpreter), SCons, SWIG, zlib, m4, and lastly protobuf if you want trace capture and playback support. Please see http://www.gem5.org/documentation/general_docs/building for more details concerning the minimum versions of the aforementioned tools. Once you have all dependencies resolved, type 'scons build/<ARCH>/gem5.opt' where ARCH is one of ARM, NULL, MIPS, POWER, SPARC, or X86. This will build an optimized version of the gem5 binary (gem5.opt) for the the specified architecture. See http://www.gem5.org/documentation/general_docs/building for more details and options. The basic source release includes these subdirectories: - configs: example simulation configuration scripts - ext: less-common external packages needed to build gem5 - src: source code of the gem5 simulator - system: source for some optional system software for simulated systems - tests: regression tests - util: useful utility programs and files To run full-system simulations, you will need compiled system firmware (console and PALcode for Alpha), kernel binaries and one or more disk images. If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.